Dallas, TX Accessory Structures: ADU Impact Fees (2026)

Dallas does not offer ADU-specific impact fee waivers. Standard development fees apply: building permit fees based on construction valuation (typically $400–$800 for small ADUs), plan-check fees (about 65% of the permit fee), and trade permit fees (electrical, plumbing, mechanical). Dallas Water Utilities (DWU) charges impact fees under Dallas City Code Ch. 49 when a new water/sewer connection is required — typically $2,000–$5,000 for water and $1,500–$4,000 for sewer based on the 2024 schedule. DWU strongly encourages ADUs to share the principal dwelling's existing tap to avoid these fees. Oncor (electric) and Atmos Energy (gas) handle service-extension fees separately. Roadway impact fees under Dallas City Code Ch. 49A may apply for new dwelling units in certain service areas. Texas does not have a statewide ADU impact-fee waiver analogous to California Gov. Code § 65852.2(f). Affordable housing programs administered by the Department of Housing and Neighborhood Revitalization may waive certain fees for income-restricted ADUs, but these are limited and require separate application.